xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

s390/mm: use memset64 instead of clear_table

Browse Source 
Use memset64 instead of the (now) open-coded variant clear_table.
Performance wise there is no difference.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2017-10-04 19:27:07 +02:00
committed by Martin Schwidefsky
parent 0b77d6701c
commit 41879ff65d
4 changed files with 12 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
arch/s390/mm/pgalloc.c
View File

@@ -158,13 +158,13 @@ static inline unsigned int atomic_xor_bits(atomic_t *v, unsigned int bits)
struct page *page_table_alloc_pgste(struct mm_struct *mm)
{
struct page *page;
unsigned long *table;
u64 *table;
page = alloc_page(GFP_KERNEL);
if (page) {
table = (unsigned long *) page_to_phys(page);
clear_table(table, _PAGE_INVALID, PAGE_SIZE/2);
clear_table(table + PTRS_PER_PTE, 0, PAGE_SIZE/2);
table = (u64 *)page_to_phys(page);
memset64(table, _PAGE_INVALID, PTRS_PER_PTE);
memset64(table + PTRS_PER_PTE, 0, PTRS_PER_PTE);
}
return page;
}
@@ -221,12 +221,12 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
if (mm_alloc_pgste(mm)) {
/* Return 4K page table with PGSTEs */
atomic_set(&page->_mapcount, 3);
clear_table(table, _PAGE_INVALID, PAGE_SIZE/2);
clear_table(table + PTRS_PER_PTE, 0, PAGE_SIZE/2);
memset64((u64 *)table, _PAGE_INVALID, PTRS_PER_PTE);
memset64((u64 *)table + PTRS_PER_PTE, 0, PTRS_PER_PTE);
} else {
/* Return the first 2K fragment of the page */
atomic_set(&page->_mapcount, 1);
clear_table(table, _PAGE_INVALID, PAGE_SIZE);
memset64((u64 *)table, _PAGE_INVALID, 2 * PTRS_PER_PTE);
spin_lock_bh(&mm->context.lock);
list_add(&page->lru, &mm->context.pgtable_list);
spin_unlock_bh(&mm->context.lock);